Connect the pieces which are indoor sports.
Connect the pieces which are outdoor sports.
Connect the sports with their equipment as a two piece puzzle besides the three piece puzzle and the  examples shown other play possibilities:

• Connect all the centre pieces to get an idea of all the sports play areas.
• Connect the pieces which have a stadium.
• Sort out the matched pairs which reveal team sports.
• Sort out the matched pairs which show one to one contests.
• Sort out the matched pairs in which there is ball play.
• Connect the centre pieces for sports having a net.